Horology: time measuring systems or devices – Regulating means – For adjusting the frequency or beat
Patent
1990-08-17
1992-07-07
Wieder, Kenneth A.
Horology: time measuring systems or devices
Regulating means
For adjusting the frequency or beat
368202, 331 44, 331 55, 324782, 324 85, G04B 1800, G04B 1720
Patent
active
051289091
ABSTRACT:
A system to measure time based on the output of a plurality of clocks employs a common oscillator, rather than a frequency synthesizer. Phase differences between a plurality of clocks are measured by mixing the output from each clock with the output of the common oscillator and detecting the zero crossing of each of the resulting beat signals. The zero crossings are counted and used to start and stop time interval counters, which count the time intervals between zero crossings of the beat signals from different clocks. The output of one of the clocks is used to provide a time base. The output of the first clock is input to a divider, and the divided signal used to start the first of the time interval counters. The number of zero crossings of the divided signal are also counted so that the relative frequency of the common oscillator can be determined. The output of the divider can be synchronized with an external clock.
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Stein et al., "Performance of an Automated High Accuracy Phase Measurement System", Proceedings of the 36th Annual Symposium on Frequency Control, pp. 314-320, Jun., 1982.
Alberding Gilbert E.
Ball Corporation
Solis Jose M.
Wieder Kenneth A.
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